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## org.bouncycastle.crypto.engines
Class ChaChaEngine

    java.lang.Object
      org.bouncycastle.crypto.engines.Salsa20Engine
          org.bouncycastle.crypto.engines.ChaChaEngine

All Implemented Interfaces:
  SkippingCipher, SkippingStreamCipher, StreamCipher

public class ChaChaEngine
extends Salsa20Engine

Implementation of Daniel J. Bernstein's ChaCha stream cipher.

Field Summary

Fields inherited from class org.bouncycastle.crypto.engines.Salsa20Engine
`DEFAULT_ROUNDS, engineState, rounds, sigma, tau, x`

Constructor Summary
`ChaChaEngine()` Creates a 20 rounds ChaCha engine.
`ChaChaEngine(int rounds)` Creates a ChaCha engine with a specific number of rounds.

Method Summary
`protected void` | `advanceCounter()`
`protected void` | `advanceCounter(long diff)`
`static void` | `chachaCore(int rounds, int[] input, int[] x)` ChaCha function
`protected void` | `generateKeyStream(byte[] output)`
`java.lang.String` | `getAlgorithmName()` Return the name of the algorithm the cipher implements.
`protected long` | `getCounter()`
`protected void` | `resetCounter()`
`protected void` | `retreatCounter()`
`protected void` | `retreatCounter(long diff)`
`protected void` | `setKey(byte[] keyBytes, byte[] ivBytes)`

Methods inherited from class org.bouncycastle.crypto.engines.Salsa20Engine
`getNonceSize, getPosition, init, packTauOrSigma, processBytes, reset, returnByte, salsaCore, seekTo, skip`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ChaChaEngine

    public ChaChaEngine()

  Creates a 20 rounds ChaCha engine.

### ChaChaEngine

    public ChaChaEngine(int rounds)

  Creates a ChaCha engine with a specific number of rounds.

Parameters:
  `rounds` - the number of rounds (must be an even number).

Method Detail

### getAlgorithmName

    public java.lang.String getAlgorithmName()

  Description copied from interface: `StreamCipher`
  Return the name of the algorithm the cipher implements.

  Specified by:
    `getAlgorithmName` in interface `StreamCipher`
  Overrides:
    `getAlgorithmName` in class `Salsa20Engine`

### advanceCounter

    protected void advanceCounter(long diff)

  Overrides:
    `advanceCounter` in class `Salsa20Engine`

### advanceCounter

    protected void advanceCounter()

  Overrides:
    `advanceCounter` in class `Salsa20Engine`

### retreatCounter

    protected void retreatCounter(long diff)

  Overrides:
    `retreatCounter` in class `Salsa20Engine`

### retreatCounter

    protected void retreatCounter()

  Overrides:
    `retreatCounter` in class `Salsa20Engine`

### getCounter

    protected long getCounter()

  Overrides:
    `getCounter` in class `Salsa20Engine`

### resetCounter

    protected void resetCounter()

  Overrides:
    `resetCounter` in class `Salsa20Engine`

### setKey

    protected void setKey(byte[] keyBytes,
                          byte[] ivBytes)

  Overrides:
    `setKey` in class `Salsa20Engine`

### generateKeyStream

    protected void generateKeyStream(byte[] output)

  Overrides:
    `generateKeyStream` in class `Salsa20Engine`

### chachaCore

    public static void chachaCore(int rounds,
                                  int[] input,
                                  int[] x)

  ChaCha function

  Parameters:
    `input` - input data

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